89991728773 has 2 divisors, whose sum is σ = 89991728774. Its totient is φ = 89991728772.

The previous prime is 89991728759. The next prime is 89991728779. The reversal of 89991728773 is 37782719998.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85426429284 + 4565299489 = 292278^2 + 67567^2 .

It is a cyclic number.

It is not a de Polignac number, because 89991728773 - 2²¹ = 89989631621 is a prime.

It is a super-2 number, since 2×89991728773² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89991728779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44995864386 + 44995864387.

It is an arithmetic number, because the mean of its divisors is an integer number (44995864387).

Almost surely, 2^89991728773 is an apocalyptic number.

It is an amenable number.

89991728773 is a deficient number, since it is larger than the sum of its proper divisors (1).

89991728773 is an equidigital number, since it uses as much as digits as its factorization.

89991728773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96018048, while the sum is 70.

The spelling of 89991728773 in words is "eighty-nine billion, nine hundred ninety-one million, seven hundred twenty-eight thousand, seven hundred seventy-three".